Isocyanate - Wikipedia
In organic chemistry, isocyanate is the functional group with the formula R−N=C=O. Organic compounds that contain an isocyanate group are referred to as isocyanates. An organic compound with two isocyanate groups is known as a diisocyanate.
Polyisocyanurate - Wikipedia
Polyisocyanurate (/ ˌpɒlɪˌaɪsoʊsaɪˈænjʊəreɪt /), also referred to as PIR, polyol, or ISO, is a thermoset plastic [1] typically produced as a foam and used as rigid thermal insulation.
Polyisocyanates: A deep dive behind the chemistry - Prospector by …
2021年7月15日 · Therefore, nonisocyanate polyurethanes (NIPU) materials are considered the best consideration of being nontoxic and ecofriendly and have created a great deal of attention as equated to the conventional polyurethane (PU) obtained …
Polyisocyanates - Big Chemical Encyclopedia
Major polyisocyanates in the market are listed in Table 3. TDI is widely used for flexible foams. Pure MDI is used for elastomers and coatings. Modified TDI and modified MDI are used for high-resilience flexible foams.
Fully Bio-Based Thermosetting Polyurethanes from Bio-Based …
In this work, we studied 3 polyisocyanates and 2 polyols with high renewable carbon contents, namely L-lysine ethyl ester diisocyanate (LDI), pentamethylene-diisocyanate (PDI) isocyanurate trimer, and hexamethylene-diisocyanate (HDI) allophanate as the isocyanates, as well as castor oil and polypropanediol as the polyols.
Isocyanate-Based Polymers: Polyurethanes, Polyureas
2017年1月1日 · Hexamethylene diisocyanate (HDI) was the first polyisocyanate produced for PU synthesis. It has high vapor pressure, so has to be used under well-ventilated conditions, or normally chemically modified to reduce its volatility. It is used in PU elastomers and coatings, giving good abrasion and UV resistance.
Polyisocyanides, Polyisocyanates - SpringerLink
2014年1月1日 · Polyisocyanides and polyisocyanates are both obtained by the polymerization of monomers with a highly reactive functional group, isocyanide and isocyanate, respectively, and the polymerization utilizes the unique reactivity of each functional group.
Synthetic Control of Helical Polyisocyanates by Living Anionic ...
2022年2月22日 · Interest in polyisocyanates with helical properties is driven by various synthesis methods. Furthermore, the living characteristics of the polymerization of isocyanate have been studied with kinetics. The rigid-rod structures of polyisocyanates generate specific morphologies of block copolymers.
Blocking and Deblocking of Diisocyanate to Synthesize …
Diisocyanates, particularly toluene diisocyanate (TDI), are useful for the preparation of various polyurethanes with specific applications as leather-like materials, adhesives and insoles, etc. Blocking agents can be used for the operational simplicity and to reduce the hazards of TDI.
Polyurethanes are thermoset polymers formed from polyisocyanates (most commonly diisocyanates) and polyfunctional compounds containing numerous hydroxyl groups.